Cryogenic GGC Valves
Cryogenic Gate Valves, Globe Valves, and Check Valves are designed for service with low-temperature media below -29℃. These are typically categorized into three temperature ranges:-29℃ to -46℃ (or -50℃)-46℃ (or -50℃) to -101℃ (or -110℃)-101℃ (or -110℃) to -196℃Applications below -196℃ are extremely rare and generally limited to media such as liquid hydrogen or liquid helium. MECCO has conducted targeted research in this area and successfully developed prototype valves for such conditions.Cryogenic valves are designed and manufactured in accordance with BS 6364, ISO 28921-1, MSS SP-134, SPE 77-200, GB/T 24925, and other applicable standards. Available pressure ratings include CL150, CL300, CL600, CL800, CL900, CL1500, and CL2500 (or PN16 to PN420).For cryogenic gate valves rated CL600 and below, MECCO provides integral bonnet forging dies up to NPS16, and for globe valves up to NPS12. Bonnet extensions meet the height requirements specified in SPE 77-200. For valve sizes beyond this range, if welding of extended bonnets is not permitted or if special height requirements are specified by the customer, custom die design solutions can be offered.
Size:
NPS1/2~~NPS48 (DN15~~DN1200), sizes beyond this range can be customized according to customer requirements.
Material:
Body material according to customer order requirements. For temperatures -29℃\~-46℃ (or -50℃), LCB or LF2 is generally used. For temperatures below -46℃ (or -50℃), austenitic stainless steels are generally used, such as CF8 (F304), CF3 (F304L), CF8M (F316), CF3M (F316L), etc.
Internal parts/Stem:
Sealing surfaces are generally made of Stellite hard alloy or high-alloy steel with performance exceeding that of austenitic stainless steel. The stem is made of integrally forged austenitic stainless steel or other high-alloy steel, or configured according to customer requirements.
Structure:
The valve body is the same as that of conventional valves. The extended bonnet is designed according to the standards described in the introduction, either as an integrally extended bonnet (without welding), or with an additional pipe section in the middle of the bonnet, welded by butt welding (full penetration). Gas shielded welding is not allowed (as it cannot ensure finished product impact performance). Weld seams must be inspected using non-destructive testing to confirm weld quality. Gate valves are provided with a pressure relief hole and marked as required by the customer.
Operation mode:
Manual, gear drive, electric, pneumatic, or automatic, etc.
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